Index: roster-app/src/java/org/sakaiproject/tool/roster/ParticipantImageServlet.java
===================================================================
--- roster-app/src/java/org/sakaiproject/tool/roster/ParticipantImageServlet.java	(revision 92424)
+++ roster-app/src/java/org/sakaiproject/tool/roster/ParticipantImageServlet.java	(working copy)
@@ -38,6 +38,7 @@
 import org.sakaiproject.api.app.roster.RosterFunctions;
 import org.sakaiproject.authz.cover.SecurityService;
 import org.sakaiproject.component.cover.ComponentManager;
+import org.sakaiproject.component.cover.ServerConfigurationService;
 import org.sakaiproject.site.cover.SiteService;
 import org.sakaiproject.tool.cover.ToolManager;
 import org.sakaiproject.util.ResourceLoader;
@@ -140,10 +142,12 @@
 	private void displayLocalImage(OutputStream stream)
 	{
 		String unavailable_image = msgs.getString("img_off_unavail");
+		// If sakai.property is set, then use that instead
+		String unavailable_image_property = ServerConfigurationService.getString("roster_img_off_unavail", "");
 
 		if (LOG.isDebugEnabled())
 			LOG.debug("displayPhotoUnavailable(OutputStream" + stream + ", String "
-					+ unavailable_image + ")");
+					+ unavailable_image + " "+unavailable_image_property+")");
 		try
 		{
 			BufferedInputStream in = null;
@@ -152,6 +156,10 @@
 
 				in = new BufferedInputStream(new FileInputStream(getServletContext()
 						.getRealPath(unavailable_image)));
+						
+				if (!"".equals(unavailable_image_property)) {
+				    in = new BufferedInputStream(new FileInputStream(unavailable_image_property));
+				}
 				int ch;
 
 				while ((ch = in.read()) != -1)